Abstract:Magnoliaceae plants have both ornamental, medicinal,timber, ecological and scientific value. They have profound cultural connotations and a wide range of adaptations covering almost the entire China. They can be used as important plant materials for the construction of low-carbon ecological garden cities, but their relatively poor resistance to stress has become an important bottleneck restricting its garden application and promotion. This study is to explore waterlogging tolerance germplasm resources. According to the phenotypic changes of Magnoliaceae plants during the process of flooding stress, four indicators including leaf color change, plant wilting condition, stem base change and survival rate change were selected, and they were quantitatively classified. Formulate the grade score standard and evaluation plan, and then comprehensively evaluate the waterlogging tolerance based on the sum of the scores of each index, and establish the waterlogging tolerance evaluation system of Magnoliaceae plants. In this study, 2-3 year-old seedlings of 31 magnolia species have been identified for waterlogging tolerance, and 3 excellent magnolia germplasms with strong waterlogging tolerance have been initially screened.
